2048-webcomponent

This is 2048 as a WebComponent. Once you integrate it as described further, the game just follows the standard rules. To make a move, just use the arrow keys or swipe.

Getting Started

Install the package via npm or yarn and deliver the script to the user. This can be done via import, require or just inserting a script tag.

npm i 2048-webcomponent

yarn add 2048-webcomponent

Attributes

Param	Type	Description	Default
columns	number	Amount of columns of the board.	4
rows	number	Amount of rows of the board.	4
swipe-distance-threshold	number	Amount of pixels required to trigger a swipe.	50
restart-selector	string	If present, attaches a click event listener to the element to trigger a restart.

Events

By default, each event contains the current game state in event.detail.game. To discourage cheating, no events should be logged in the browser console.

Name	Type	Cancelable	Description	detail
2048:game-won	GameWonEvent	❌	User just won the game	positions: Positions current game state
2048:game-lost	GameLostEvent	❌	User just lost the game	positions: Positions current game state
2048:move	MoveEvent	✅	User made a move	positions: Positions current game state direction: Direction direction of the move
2048:score	ScoreEvent	❌	Score has been updated	positions: Positions current game state oldScore: number | undefined old score delta: number | undefined difference between old and new score newScore: number current score

Usage

Basic usage

Just a basic 9x9 / 10 Mines 2048 game. Further examples can be combined.

<game-2048></game-2048>

<script type="module">
  import '2048-webcomponent';
  // Alternatives:
  // import '2048-webcomponent/custom-element';
  // import '2048-webcomponent/custom-element.min';
</script>

Custom tag name

Define your own custom tag name

<custom-game-2048></custom-game-2048>

<script type="module">
  import { Game } from '2048-webcomponent/game-2048';
  // Alternative:
  // import { Game } from '2048-webcomponent/game-2048.min';
  window.customElements.define('custom-game-2048', Game);
</script>

Provide a restart button

Provide a selector where a "click"-event will be attached to, to restart the game.

<game-2048 restart-selector="#restart-game-button"></game-2048>
<button id="restart-game-button">Restart!</button>

<script type="module">
  import '2048-webcomponent';
</script>

Trigger Restart via JavaScript

Write custom logic to restart the game.

<game-2048 id="game"></game-2048>
<button id="restart-game-button-confirm">Restart with Confirm!</button>

<script type="module">
  import '2048-webcomponent';

  window.addEventListener('DOMContentLoaded', () => {
    const game = document.querySelector('#game');

    document.querySelector('#restart-game-button-confirm').addEventListener('click', (event) => {
      event.preventDefault();
      if (window.confirm('Are you sure, that you want to restart the game?')) {
        game.restartGame();
      }
    });
  });
</script>

Custom win/lose event listener

Attach an EventListener for the win/lose events.

<game-2048 id="game"></game-2048>

<script type="module">
  import '2048-webcomponent';

  window.addEventListener('DOMContentLoaded', () => {
    const game = document.querySelector('#game');

    game.addEventListener('game-won', () => {
      console.log('win');
    });

    game.addEventListener('game-lost', () => {
      console.log('lose');
    });
  });
</script>

Different initial game configurations

Of course you can provide different configurations for the game.

<game-2048 rows="5" columns="5"></game-2048>

<script type="module">
  import '2048-webcomponent';
</script>

Example

Try it out at CodePen.

TypeScript

The whole package is written in TypeScript and therefore provides a strongly typed system via the core export of the package:

<!-- some-file.html -->
<game-2048 id="game"></game-2048>

// some-file.ts
import '2048-webcomponent/custom-element';
import { FieldInteractionEvent, FieldInteractionType } from '2048-webcomponent/core';
import type { Game } from '2048-webcomponent/core';

const game = document.querySelector('#game') as Game;
game.addEventListener('2048:field-interaction', (event: FieldInteractionEvent) => {
  const { interaction } = event.detail;
  switch (interaction.type) {
    case FieldInteractionType.Unveiled:
      console.log('Revealed field value:', interaction.value);
      break;
    case FieldInteractionType.FlagAction:
    case FieldInteractionType.QuestionMarkAction:
      console.log('Performed action:', interaction.action);
      break;
  }
});

Engine

The engine can be used as a standalone library (commonjs and esm) via the engine export of the package. This enables the usage of the engine in every application (server- or client-side).

import { Direction } from '2048-webcomponent/core';
import { Engine } from '2048-webcomponent/engine';

const engine = new Engine();

engine.createBoard(3, 3);

engine.move(Direction.Up);

if (engine.isGameOver) {
  // Restarts the game with the initial configuration
  engine.restart();
}

const { Engine } = require('2048-webcomponent/engine');

const engine = new Engine();

// ...

License

MIT License